What I don't like about #1 is the shadowy diagonal line (I think it's a cord?) It draws my eye & I can't "not" see it.
However I love being able to clearly see the gill texture in #3, they echo the stripes on the fishes body - I thought that was cool and I never saw that before.
#8 is also one of my favorites - I like the strong rock diagonals "pushing" the fish front and center making it the clear focal point. The focus seems sharper on #8 than #3 too, but I still can't decide between the two of them!
In the end, I voted for #8...